diff --git a/pkgs/development/ocaml-modules/herelib/default.nix b/pkgs/development/ocaml-modules/herelib/default.nix
index fd955602844..716e31b2bfe 100644
--- a/pkgs/development/ocaml-modules/herelib/default.nix
+++ b/pkgs/development/ocaml-modules/herelib/default.nix
@@ -4,7 +4,7 @@ buildOcaml rec {
   version = "109.35.02";
   name = "herelib";
 
-  minimumSupportedOcamlVersion = "4.02";
+  minimumSupportedOcamlVersion = "4.00";
 
   src = fetchurl {
     url = "https://github.com/janestreet/herelib/archive/${version}.tar.gz";